T-60S never got off the drawing board. The program was initially given to Sukhoi and Tupolev as a assistant. When Sukhoi began to develop problems, they were shelved and the more conventional Tu-160 was developed instead.
Aviation author Yefim Gordon has a great book on the development of the Tu-160, and its explains some of the unusual situation around the development and cancellation of the T-60S.
Aviation author Yefim Gordon has a great book on the development of the Tu-160, and its explains some of the unusual situation around the development and cancellation of the T-60S.